Wagstaff primes: Difference between revisions
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3539
5807
</pre>
=={{header|Sidef}}==
<syntaxhighlight lang="ruby">var iter = Enumerator({|callback|
var p = 2
loop {
var t = ((2**p + 1)/3)
callback([p, t]) if t.is_prime
p.next_prime!
}
})
var n = 1
say "Index Exponent Prime"
say "-"*31
iter.each {|k|
var (e, p) = k...
p = "(#{p.len} digits)" if (n > 10)
say "#{'%5s'%n} #{'%8s'%e} #{'%16s'%p}"
break if (n == 24)
++n
}</syntaxhighlight>
{{out}}
<pre>
Index Exponent Prime
-------------------------------
1 3 3
2 5 11
3 7 43
4 11 683
5 13 2731
6 17 43691
7 19 174763
8 23 2796203
9 31 715827883
10 43 2932031007403
11 61 (18 digits)
12 79 (24 digits)
13 101 (30 digits)
14 127 (38 digits)
15 167 (50 digits)
16 191 (58 digits)
17 199 (60 digits)
18 313 (94 digits)
19 347 (104 digits)
20 701 (211 digits)
21 1709 (514 digits)
22 2617 (788 digits)
23 3539 (1065 digits)
24 5807 (1748 digits)
</pre>
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